Machine for sewing looped fabrics.



No; 632,042. Patented Aug. 29, I899;

F. CAMPBELL.

MACHINE FOR SEWING LDOPED FABRICS.

(Application filed Oct. 4, 1897.)

2 Sheets-Sheet I.

(No Model.)

Inventor.- Euncis Campfiell, WM m. M

Witnesses is mews c0, mmuwu. WASNINGTGN. mc.

Patented Aug. 29, I899. F. CAMPBELL. v MACHINE FOB SEWING LDOPED FABRICS.

(Application filed Oct. 4, 1897.)

2 Sheets Sheet 2.

(No Model.)

Invenfior- Bun-sis C cmyvfiell,

Wfnesses j wdmw 6- Qfliformgy.

UNITED STATES.

PATENT OFFICE.

FRANCIS CAMPBELL, OF COHOES, NEW' YORK, ASSIGNOR OF ONE-HALF'TO CAMPBELL & CLUTE, OF SAME PLACE.

MACHINE FOR SEWING LOOPED FABRICS.

SPECIFICATION forming part of Letters Patent No. 632,042, dated August 29, 1899.

Application filed October 4, 1897.

To (.LZZ whom it may concern.-

Be it known that I, FRANCIS CAMPBELL, a citizen of the United States,residing at Northside Cohoes, in the county of Saratoga and State of New York, have invented new and useful Improvements in Machines for Sewing Knitted or Looped Fabrics, of which the following is a specification.

My invention relates to improvements in machines for sewing together two or .more thicknesses of knitted or looped fabrics; but it especially relates to improvements in the stitch-forming mechanisms of such machines. In the accompanying drawings, which are herein referred to and form part of this specification, Figure 1 is a partial plan view of a machine embodying my invention; Fig. 2, a side elevation of the stitch-forming mechanism, showing the needle-arm in its retracted position and the looper-arm in position for holding the looper at the highest point of its movement, a portion of the point-ring and adjacent parts being shown in vertical section Fig. 3, a like elevation showing the needle-arm and looper-arm at the opposite extremity of their movements; Fig. 4, a front elevation of Fig. 3; Fig. 5, a vertical section of Fig. 4 at the line X X, omitting the needle-arm and showing the cam for operating the looper-arm in rear elevation; Fig. 6, a side elevation of said cam with its hub broken away to expose the parts of said cam that lie behind said hub, and Figs. 7 and 8 are re spectively an enlarged plan view and a side elevation of the looper detached from the looper-arm.

As represented in the drawings, A designates the base-plate of my machine, which'is made in an old and Well-known form and is attachable in the usual manner to a table or other suitable means for supporting such machines. The upper face of said base-plate is provided with standards 1 and 2, the first of which forms a journal-bearing for a drivingshaft B, by which motion is imparted to the different operating parts of the machine, and the other, in addition to forming a journalbearing for said shaft, forms a support for other parts of the machine, particularly for an arm 3, which carries a circular plate C, on which a point-ring D is fitted to revolve intermittently in a usual manner and by the Serial No. 654,005. (No modelh means commonly employed for that purpose.

The point-ring has protruding from its periphery a series of sharp points E, which afford the usual means for attaching the fabrics to the machine by impalin g them on said points.

F is a disl; which is secured eccentrically on the shaft B and has in its outer plane face a circular groove 4, which is eccentric to the center of said shaft. A segmental follower 5 is fitted to slide freely in said groove and is pivoted to the free end of a needle-arm G, which is pivoted to oscillate on a stud 6, which is horizontally adjustable in a slotted opening 7, formed in the standard 2. Said needle-arm carries a curved needle H, which has an eye near its point, through which a needle-thread 8 passes to form one part of a double-thread lock-stitch which is formed by the machine. Said needle is moved by the oscillations of the needle-arm G, and the rotative movement of the point-ring D will cause the points E to be moved successively into positions, where the needle II will in turn swing directly over each of said points to effect its part in the formation of the stitches. H is a looper-arm, which is fitted to oscillate on a stud 9, that is vertically adjustable in a slotted opening 10, formed in a lug 11 on the upper face of the base-plate A. Said looper-arm has the form of a bell-crank, and its lateral limb 12 carries a looper I, which is vertically adjustable in a stud 13, that is secured in a fixed position parallel to the stud 9 and has an endwise adjustability in the outer end of the limb 12. The other limb, 14:, of said looper-arm has an outwardlye'xtendinglug 15 and a laterally-extending lug 16, formed on its free end. The last-named lug has its face parallel or practically parallel to the face of the limb 14, and the-purposes of both of said lugs will be defined hereinafter. A spring 17 surrounds the stud 9 and inter-poses between the hub of the looperarm H and the lug 11, so as to push said looperarm away from said lug, and a spring 18, connected to the outer end of the limb 12 and to a fixed part of the machine, vibrates the looper-arm H toward the shaft B but the Vibrations of said arm in the opposite direction are efiected by means hereinafter set forth. It should be understood that the looper I carthe periphery of said cam is provided, successively, with the following formations: A curved bearing-face 19, that is concentric-to the center of the shaft B, so that when the lug 15, which is arranged to bear against the periphery of said cam, is in contact with the bearing-face 19 no movement of the looperarm H will occur. A straight bearing-face 20 succeeds the bearing-face 10 and will allow the looper-arm under the strain of the spring 18 to swing slightly toward the center of the shaft B. Following the last-named bearingface there is a second curved bearingface 21, which is formed concentrically to the center of the shaft B, but is nearer the center of said shaft than the bearing-face 1!), so that the looper-arm H will, under the strain of the spring 18, be swung nearer to the center of the shaft 13 than it was while in contact with the bearing-face 19; but while the lug 15 is in contact with the bearing-face 21 no oscillatory movement of the looper-arm H takes place. Succeedingthecurvedbearing-face2l the periphery of said cam has a straight bearing-face 22, which joins to the curved bearing-face 19 and allows the looper-arm H to move away from the shaft B. The vibratile movements of the looper-arm H will continue as long as the cam J continues its rotations. The rearmost face of the cam J is provided with a rim 23, which is formed into a succession of bearing-faces on its face at right angles to its axis of rotation and against which the lug 16 will be forced by the spring 17 to bear in rotation. Taking as an initial point the angle where the peripheral bearing-face 19 is joined to the bearing-face 22 the edge of the rim 23 has a suddenly-inclined bearing-face 24, which will allow the looper-arm H to move toward the disk F while the lug 15 is in contact with the bearing-face 22 and until the latter has nearly joined to the bearing-face 21. Succeeding the bearing-face 2 there is a gradually-inclined bearingface 25, which inclines away from the back of the disk F until the last-named bearing-face has reached a point that nearly coincides with the middle of the bearing-face 20, where it is merged into another inclined bearing-face 26, which is at a greater inclination than the bearing-face 25 until it is joined to a bearing-face 27, that is parallel with the face of the disk F, and therefore produces no movement of the looper-arm H, and the last-named bearing-face is then merged into the bearingface 24-. The cam J by its peripheral and other bearing-faces produces the following movements of the looper-arm H; While the needle-arm G is at the extremity of its movement from the point-rin g D, the looper-arm H by its lugs 15 and 16 will bear against the peripheral bearing-face 21 and the bearing-face 25,whereby the looper I will be moved slightly back from its normal'position. The needlethread 8 is in the form of a loop over the looper I, said loop being between the two eyes of the looper I. By the rotation of the cam J the bearing-face 25 will force the looper I to move backward, thereby gradually withdrawing the looper from the loop of the needle-thread 8 sufficiently to allow the needle H to enter a fork formed by the crossing of the needle-thread over the looper-thread, at which point the looper I drops while the lug 15 is passing over the bearing-face 20, allowing the looper I to pass below the path of the needle H. The latter in making a forward movement passes over the looper I to form a new loop in the needle-thread 8, and this op eration is continued until the line of stitching is completed.

By referring to Figs. 7 and 8 it will be seen that the looper I-has its opposite edges curved toward the center line of said looper to form a point 28, and the lower face of said looper is curved upwardly, as at 29, to meet said point, and by this formation of the end of the looper theoperations of the looper in taking up and casting on the loop of the needlethread is greatly facilitated.

What I claim as my invention, and am desirous of securing by Letters Patent, is-

. In the stitch-forming mechanism of a machine for sewing looped or knitted fabrics by two independent threads, the combination, with a point-ring, D, provided with a series of radial points,- E, a needle-arm, Gr, provided with a curved needle, H, which carries one of the stitching-threads, a cam F adapted to oscillate said needle-arm, a looper-arm, H,

. provided with a looper, I, having a lateral arm whose two edges and lower face are curved to form a point, 28, at the center line of the lateral arm; the latter having two adjacent perforations for the complementary stitching-thread; said looper being vertically adjustable in the looper-arm, and the latter being arranged to oscillate and to slide laterally on a stud, 9, that is located directly under and arranged parallel with a stud, 6, on which the needle-arm is fitted to oscillate, a spring, 17, arranged to laterally push said looper-arm, and a'spring, 18, that will oscillate the looper-arm in one direction of its movements, of a cam, J, provided with bearing-faces, 19, 20, 21 and 22, on its periphery, and bearing-faces, 24:, 25, 26 and 27, formed on the edge of a rim, 23, on the rearmost face of the cam, as herein specified.

FRANCIS CAMPBELL. WVitnesses:

WM. H. Low, J. W. FISHER.

IIO 

